一个小型网上书店，前段的注册采用了Ajax与后台结合验证,后台自己写的，由于本人对前端的了解太少，后台的界面都很丑，但功能都有了(A small online bookstore is registered in the earlier stage. Ajax and background are combined to verify. The background is written by oneself. Because I know too little about the front-